LPR N Tester Valve For Cased Hole Drill Stem Testing High Pressure
Tester Valve
Introduction of the LPR N Tester Valve
The LPR-N Tester Valve is a kind of full-opening, annulus
pressure-operated valve which is applied for downhole testing
operation as main tester valve. The LPR N Valves permit measuring
multi pleclosed-in pressures in cased holes where pipe manipulation
is restricted and afull-opening string is required.
Specification of the LPR N Tester Valve
Tool Size in. |
OD / in. |
ID /in. |
Thread Connections | Service Temperature* °F |
Length in. | Working Pressure / psi |
| 3 7/8 | 3.90 | 1.80 | 2 7/8 CAS | 450 | 199.88 | 10,000 |
| 5.00 | 5.03 | 2.25 | 3 7/8 CAS | 450 | 191.30 | 15,000 (1034) |
How to operate the LPR N Tester Valve
The LPR-N tester valve consist of three section, including ball
valve section, a power section, and a metering section.
The ball valve section contains the ball valve and related
mechanical components that rotate the ball, which provides multiple
downhole closures . When the LPR N Tester valve is activated, the
ball is rotated to the open position, allowing the reservoir to
flow into the test string. Depending on how the tool is assembled,
it can be run in the hole in the closed or open position.
The power/nitrogen section contains the shear pins, operating
piston, and nitrogen chamber. In the power section, one side of the
piston is exposed to annulus pressure, and the other is exposed to
pressurized nitrogen.
The metering section of the tool is isolated from the annulus fluid
by an oil and floating piston barrier and controls the rate of
pressure change in the nitrogen chamber.
When testing is started, pressure will be pumped quickly to the
annulus to a predetermined pressure, and hold for 10 minutes to
pressurize the nitrogen chamber. After pressure has been metered
through the metering cartridge, pressure in the nitrogen chamber
will be slightly less than combined hydrostatic and pump pressure
in the annulus, which will help to ensure that the ball valve stays
open during testing or treating operations.
Drill stem testing tools for cased hole, open hole and slim hole:
Full bore retrievable packer, full bore retrievable circulating
valve, full bore retrievable safety joint, downhole tester valve,
select tester valve, LPR- N Valve, omni valve, multi-cycle
circulating valve, hydraulic jar, vertical shock absorber, radial
shock absorber, RD safety circulating valve, high pressure
retrievable packer with bypass, CHAMP packer, IPO valve, tubing
string test valve, sleeve type drain valve, rupture disk sampler,
super safety valve with control panel, BOP safety valve for
downhole operation and so on.
